Other Dialog: which types of dialog boxes can one rely on being available?

The dialog manual page starts its list of the dialog box types with this introductory sentence:

These types of dialog boxes are implemented (though not all are necessarily compiled into dialog): ...

Thus I would like to ask: Is there a defined minimum (sub)set of these dialog box types that one can depend on being *always* available?

Because, I browsed the FreeBSD source tree at Github, but failed to find the source for the dialog utility in usr.bin, usr.sbin or elsewhere.
Could please somebody hint me where I could look else?
 
I can't really answer your question, but it's in
gnu/usr.bin/dialog
gnu/lib/libdialog
contrib/dialog

Try pressing t when browsing repositories on GitHub to open the File Finder.
 
Thank you very much!
I had to find that this dialog program, which is used by the text based FreeBSD installer and the make config dialogs, for example, is not BSD licensed, but LGPL.
Now I feel a bit confused.
I hope this program will not get banned from FreeBSD...
 
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